[BOOK-421] feat: 독서 기록 수정사항 여부에 따른 버튼 활성화 상태 변경

Author: doyeonk429

src/Projects/BKPresentation/Sources/MainFlow/NoteEdit/View/NoteEditView.swift

@@ -9,6 +9,9 @@ import UIKit
 enum NoteEditViewEvent {
     case emotionStatusTapped
     case saveButtonTapped
+    case pageDidChange(String)
+    case sentenceDidChange(String)
+    case appreciationDidChange(String)
 }
 
 final class NoteEditView: BaseView {
@@ -110,6 +113,26 @@ final class NoteEditView: BaseView {
         emotionStatusView.isUserInteractionEnabled = true
 
         // BKTextFieldView와 BKTextView는 자체적으로 탭을 처리하므로 별도 제스처 불필요
+        pageField.textDidChangePublisher
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.eventPublisher.send(.pageDidChange(self.pageField.text))
+            }
+            .store(in: &cancellables)
+        
+        sentenceTextView.textDidChangePublisher
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.eventPublisher.send(.sentenceDidChange(self.sentenceTextView.text))
+            }
+            .store(in: &cancellables)
+        
+        appreciationTextView.textDidChangePublisher
+            .sink { [weak self] _ in
+                guard let self = self else { return }
+                self.eventPublisher.send(.appreciationDidChange(self.appreciationTextView.text))
+            }
+            .store(in: &cancellables)
 
         // 전체 뷰에 탭 제스처 추가 (키보드 dismiss용)
         let dismissTapGesture = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
@@ -156,6 +179,7 @@ final class NoteEditView: BaseView {
             target: self,
             selector: #selector(pageFieldDidBeginEditing)
         )
+        
     }
 
     @objc private func sentenceTextViewDidBeginEditing(_ notification: Notification) {
@@ -270,6 +294,10 @@ final class NoteEditView: BaseView {
         emotionLabel.setText(text: text)
     }
 
+    public func setSaveButtonEnabled(_ isEnabled: Bool) {
+        saveButton.isDisabled = !isEnabled
+    }
+    
     func getCurrentFormData() -> (page: Int?, sentence: String, appreciation: String) {
         let pageText = pageField.text.trimmingCharacters(in: .whitespacesAndNewlines)
         let sentenceText = sentenceTextView.text.trimmingCharacters(in: .whitespacesAndNewlines)

src/Projects/BKPresentation/Sources/MainFlow/NoteEdit/View/NoteEditViewController.swift

@@ -42,6 +42,7 @@ final class NoteEditViewController: BaseViewController<NoteEditView>, ScreenLogg
         )
         navigationItem.leftBarButtonItem = backButton
 
+        contentView.setSaveButtonEnabled(false)
         viewModel.send(.onAppear)
     }
 
@@ -121,16 +122,31 @@ final class NoteEditViewController: BaseViewController<NoteEditView>, ScreenLogg
             }
             .store(in: &cancellables)
 
+        viewModel.statePublisher
+            .map { $0.isDiff }
+            .removeDuplicates()
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] isDiff in
+                self?.contentView.setSaveButtonEnabled(isDiff)
+            }
+            .store(in: &cancellables)
     }
 
     override func bindAction() {
         contentView.eventPublisher
             .sink { [weak self] event in
+                guard let self = self else { return }
                 switch event {
                 case .emotionStatusTapped:
-                    self?.presentEmotionEdit()
+                    self.presentEmotionEdit()
                 case .saveButtonTapped:
-                    self?.handleSaveButtonTapped()
+                    self.handleSaveButtonTapped()
+                case .pageDidChange(let text):
+                    self.viewModel.send(.pageDidChange(text))
+                case .sentenceDidChange(let text):
+                    self.viewModel.send(.sentenceDidChange(text))
+                case .appreciationDidChange(let text):
+                    self.viewModel.send(.appreciationDidChange(text))
                 }
             }
             .store(in: &cancellables)
@@ -153,8 +169,7 @@ private extension NoteEditViewController {
     }
 
     func handleSaveButtonTapped() {
-        let formData = contentView.getCurrentFormData()
-        viewModel.send(.saveButtonTapped(formData: formData))
+        viewModel.send(.saveButtonTapped)
     }
 
     func presentBookMoreMenu() {

src/Projects/BKPresentation/Sources/MainFlow/NoteEdit/ViewModel/NoteEditViewModel.swift

@@ -14,6 +14,12 @@ final class NoteEditViewModel: BaseViewModel {
         var shouldPresentEmotionEdit: (emotion: Emotion?, timestamp: Date)?
         var saveCompleted: Bool = false
         var deleteCompleted: Bool = false
+        
+        var currentFormData: (page: String, sentence: String, appreciation: String) = ("", "", "")
+        
+        var initialRecordInfo: RecordInfo?
+        var initialSelectedEmotion: Emotion?
+        var isDiff: Bool = false // 변경 내용이 있는지 추적
     }
 
     enum Action {
@@ -23,10 +29,15 @@ final class NoteEditViewModel: BaseViewModel {
         case errorHandled
         case presentEmotionEdit
         case emotionSelected(Emotion)
-        case saveButtonTapped(formData: (page: Int?, sentence: String, appreciation: String?))
+        
+        case saveButtonTapped
         case patchRecordSuccessed(RecordInfo)
         case deleteButtonTapped
         case deleteRecordSuccessed
+        
+        case pageDidChange(String)
+        case sentenceDidChange(String)
+        case appreciationDidChange(String)
     }
 
     enum SideEffect {
@@ -69,15 +80,27 @@ final class NoteEditViewModel: BaseViewModel {
         switch action {
         case .onAppear:
             newState.isLoading = true
+            newState.isDiff = false
             effects.append(.fetchRecordDetail(recordId))
 
         case .fetchRecordDetailSuccessed(let recordInfo):
             newState.recordInfo = recordInfo
+            newState.initialRecordInfo = recordInfo
+            
+            newState.currentFormData = (
+                page: "\(recordInfo.pageNumber)",
+                sentence: recordInfo.quote,
+                appreciation: recordInfo.review ?? ""
+            )
+            
             // 사용자가 이미 감정을 선택했다면 덮어쓰지 않음
             if newState.selectedEmotion == nil {
-                newState.selectedEmotion = recordInfo.emotionTags.first
+                let initialEmotion = recordInfo.emotionTags.first
+                newState.selectedEmotion = initialEmotion
+                newState.initialSelectedEmotion = initialEmotion
             }
             newState.isLoading = false
+            newState.isDiff = false
 
         case .errorOccured(let error):
             newState.error = error
@@ -91,28 +114,41 @@ final class NoteEditViewModel: BaseViewModel {
 
         case .emotionSelected(let emotion):
             newState.selectedEmotion = emotion
+            newState.isDiff = checkForDiff(state: newState)
 
-        case .saveButtonTapped(let formData):
+        case .saveButtonTapped:
             guard let selectedEmotion = state.selectedEmotion,
-                  let page = formData.page,
-                  !formData.sentence.isEmpty else {
+                  let page = Int(state.currentFormData.page),
+                  !state.currentFormData.sentence.isEmpty else {
                 break
             }
 
+            // 감상평이 비어있으면 nil, 아니면 텍스트 전달
+            let appreciation = state.currentFormData.appreciation.isEmpty
+            ? nil
+            : state.currentFormData.appreciation
+            
             let noteForm = NoteForm(
                 page: page,
-                sentence: formData.sentence,
+                sentence: state.currentFormData.sentence,
                 emotion: selectedEmotion,
-                appreciation: formData.appreciation
+                appreciation: appreciation
             )
 
             newState.isLoading = true
             effects.append(.patchRecord(recordId, noteForm))
 
         case .patchRecordSuccessed(let recordInfo):
             newState.recordInfo = recordInfo
+            newState.initialRecordInfo = recordInfo
+            newState.currentFormData = (
+                page: "\(recordInfo.pageNumber)",
+                sentence: recordInfo.quote,
+                appreciation: recordInfo.review ?? ""
+            )
             newState.isLoading = false
             newState.saveCompleted = true
+            newState.isDiff = false
 
         case .deleteButtonTapped:
             newState.isLoading = true
@@ -121,6 +157,18 @@ final class NoteEditViewModel: BaseViewModel {
         case .deleteRecordSuccessed:
             newState.isLoading = false
             newState.deleteCompleted = true
+            
+        case .pageDidChange(let text):
+            newState.currentFormData.page = text
+            newState.isDiff = checkForDiff(state: newState)
+            
+        case .sentenceDidChange(let text):
+            newState.currentFormData.sentence = text
+            newState.isDiff = checkForDiff(state: newState)
+            
+        case .appreciationDidChange(let text):
+            newState.currentFormData.appreciation = text
+            newState.isDiff = checkForDiff(state: newState)
         }
 
         return (newState, effects)
@@ -159,5 +207,19 @@ final class NoteEditViewModel: BaseViewModel {
             .sink(receiveValue: send(_:))
             .store(in: &cancellables)
     }
+    
+    private func checkForDiff(state: State) -> Bool {
+        guard let initialInfo = state.initialRecordInfo else {
+            return false
+        }
+        
+        let pageDiff = state.currentFormData.page != "\(initialInfo.pageNumber)"
+        let sentenceDiff = state.currentFormData.sentence != initialInfo.quote
+        let appreciationDiff = state.currentFormData.appreciation != (initialInfo.review ?? "")
+        
+        let emotionDiff = state.selectedEmotion != state.initialSelectedEmotion
+        
+        return pageDiff || sentenceDiff || appreciationDiff || emotionDiff
+    }
 }